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Tao Liu 0311f6e25b Set zstd as the default compression method for kdump initrd
zstd has better compression ratio and time consumption balance.
When no customized compression method specified in kdump.conf,
we will use zstd as the default compression method.

**The test method:

I installed kexec-tools with and without the patch, executing the following
command for 4 times, and calculate the averange time:

$ rm -f /boot/initramfs-*kdump.img && time kdumpctl rebuild && \
  ls -ail /boot/initramfs-*kdump.img

**The test result:

Bare metal x86_64 machine:
        dracut with squash module
         zlib     lzo      xz       lz4        zstd
real     10.6282  11.0398  11.395   8.6424    10.1676
user      9.8932  11.9072  14.2304  2.8286     8.6468
sys       3.523    3.4626   3.6028  3.5        3.4942
size of
kdump.img 30575616 31419392 27102208 36666368 29236224

        dracut without squash module
        zlib      lzo      xz       lz4        zstd
real     9.509    19.4876  11.6724  9.0338    10.267
user    10.6028   14.516   17.8662  4.0476     9.0936
sys      2.942     2.9184   3.0662  2.9232     3.0662
size of
kdump.img 19247949 19958120 14505056 21112544 17007764

PowerVM hosted ppc64le VM:
        dracut with squash module | dracut without sqaush module
         zlib        zstd         |  zlib          zstd
real     10.6742     10.7572      |   9.7676       10.5722
user     18.754      19.8338      |  20.7932       13.179
sys       1.8358      1.864       |   1.637         1.663
                                  |
size of                           |
kdump.img 36917248   35467264     |  21441323      19007108

**discussion

zstd has a better compression ratio and time consumption balance.

v1 -> v2:
Use kdump_get_conf_val() to get dracut_args values of kdump.conf

v2 -> v3:
Attached testing benchmark

v3 -> v4:
Re-measured and re-attached the testing benchmark of x86_64 and ppc64le.
Changed regex '.*[[:space:]]' to '(^|[[:space:]])'

v4 -> v5:
Attacked lzo/xz/lz4 testing benchmark.

v5 -> v6:
Add zstd as required in kexec-tools.spec

Hello Coiby, you may use "RELEASE=34 make test-run", for
CONFIG_RD_ZSTD is enabled since fc-cloud-34

Acked-by: Coiby Xu <coxu@redhat.com>
Signed-off-by: Tao Liu <ltao@redhat.com>
2022-01-06 08:16:27 +08:00
tests selftest: kill VM reliably by recursively kill children processes 2021-10-15 19:20:25 +08:00
.editorconfig kdump-lib-initramfs.sh: prepare to be a POSIX compatible lib 2021-09-14 03:25:46 +08:00
.gitignore .gitignore: Update to make it more generic 2016-05-16 10:15:01 +08:00
60-kdump.install Write to /var/lib/kdump if $KDUMP_BOOTDIR not writable 2021-04-19 16:11:17 +08:00
92-crashkernel.install reset kernel crashkernel for the special case where the kernel is updated right after kexec-tools 2022-01-05 09:40:24 +08:00
98-kexec.rules Make udev reload rules quiet during bootup 2018-12-06 17:44:03 +08:00
98-kexec.rules.ppc64 Stop reloading kdump service on CPU hotplug event for FADump 2021-03-10 16:24:42 +08:00
crashkernel-howto.txt update crashkernel-howto 2022-01-05 09:40:24 +08:00
dracut-early-kdump-module-setup.sh dracut-early-kdump-module-setup.sh: install xargs and kdump-lib-initramfs.sh 2021-12-27 09:16:19 +08:00
dracut-early-kdump.sh dracut-early-kdump.sh: make it POSIX compatible 2021-09-15 23:11:37 +08:00
dracut-fadump-init-fadump.sh fadump-init: clean up mount points properly 2021-06-30 17:28:45 +08:00
dracut-fadump-module-setup.sh fadump: isolate fadump initramfs image within the default one 2021-06-29 21:35:58 +08:00
dracut-kdump-capture.service dracut-kdump-capture.service: Use OnFailureJobMode instead of deprecated OnFailureIsolate 2019-06-14 09:44:09 +08:00
dracut-kdump-emergency.service Merge kdump-error-handler.sh into kdump.sh 2021-09-14 03:25:54 +08:00
dracut-kdump-emergency.target kdump-emergency: fix "Transaction is destructive" emergency failure 2017-03-31 11:54:30 +08:00
dracut-kdump.sh Add header comment for POSIX compliant scripts 2021-09-15 23:11:37 +08:00
dracut-module-setup.sh ppc64/ppc64le: drop cpu online rule in 40-redhat.rules in kdump initramfs 2021-12-23 15:40:23 +08:00
dracut-monitor_dd_progress monitor-dd-progress fix 2013-06-25 16:45:59 +08:00
early-kdump-howto.txt Improves the early-kdump-howto.txt document in several points: 2020-03-12 23:31:34 +08:00
fadump-howto.txt Clear old crashkernl=auto in comment and doc 2021-08-05 17:54:20 +08:00
kdump-dep-generator.sh logger: source the logger file individually 2021-01-20 14:13:44 +08:00
kdump-in-cluster-environment.txt Add fence_kdump support for generic clusters 2014-04-03 14:43:06 +08:00
kdump-lib-initramfs.sh Add header comment for POSIX compliant scripts 2021-09-15 23:11:37 +08:00
kdump-lib.sh Set zstd as the default compression method for kdump initrd 2022-01-06 08:16:27 +08:00
kdump-logger.sh Add header comment for POSIX compliant scripts 2021-09-15 23:11:37 +08:00
kdump-migrate-action.sh kdump/ppc64: rebuild initramfs image after migration 2021-07-21 10:53:59 +08:00
kdump-restart.sh kdump/ppc64: rebuild initramfs image after migration 2021-07-21 10:53:59 +08:00
kdump-udev-throttler Make udev reload rules quiet during bootup 2018-12-06 17:44:03 +08:00
kdump.conf introduce the auto_reset_crashkernel option to kdump.conf 2022-01-05 09:40:24 +08:00
kdump.conf.5 introduce the auto_reset_crashkernel option to kdump.conf 2022-01-05 09:40:24 +08:00
kdump.service kdump.service: use ConditionKernelCommandLine=crashkernel 2020-10-27 12:22:36 -04:00
kdump.sysconfig Disable CMA in kdump 2nd kernel 2021-05-13 17:13:39 +08:00
kdump.sysconfig.aarch64 sysconfig: make kexec_file_load as default option on aarch64 2021-11-12 11:46:31 +08:00
kdump.sysconfig.i386 Disable CMA in kdump 2nd kernel 2021-05-13 17:13:39 +08:00
kdump.sysconfig.ppc64 Disable CMA in kdump 2nd kernel 2021-05-13 17:13:39 +08:00
kdump.sysconfig.ppc64le sysconfig: make kexec_file_load as default option on ppc64le 2021-11-12 11:47:27 +08:00
kdump.sysconfig.s390x kdump.sysconfig.s390: Remove "prot_virt" from kdump kernel cmdline 2021-07-20 15:57:05 +08:00
kdump.sysconfig.x86_64 Revert "Revert "x86_64: enable the kexec file load by default"" 2021-07-14 02:03:10 +08:00
kdumpctl set up kernel crashkernel for osbuild in kernel hook 2022-01-05 09:40:24 +08:00
kdumpctl.8 rewrite reset_crashkernel to support fadump and to used by RPM scriptlet 2022-01-05 09:40:24 +08:00
kexec-kdump-howto.txt Document/kexec-kdump-howto.txt: improve notes for kdump_pre and kdump_post scripts 2021-11-16 13:30:29 +08:00
kexec-tools.spec Set zstd as the default compression method for kdump initrd 2022-01-06 08:16:27 +08:00
live-image-kdump-howto.txt Revert "kdumpctl: filter 'root' kernel parameter when running in live images" 2017-04-11 16:03:12 +08:00
mkdumprd Set zstd as the default compression method for kdump initrd 2022-01-06 08:16:27 +08:00
mkdumprd.8 Doc: improve mkdumprd man page 2020-12-11 14:05:08 +08:00
mkfadumprd Set zstd as the default compression method for kdump initrd 2022-01-06 08:16:27 +08:00
README README: Add a README file 2014-04-02 10:45:36 +08:00
sources Release 2.0.23-1 2021-11-08 14:42:45 +08:00
zanata-notes.txt Add a notes for zanata process 2012-12-05 01:23:09 -05:00

Adding a patch to kexec-tools
=============================
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